Texas Instruments 47, 46, 27, 45, ADS5525 manual EVM Power Options, Gnd, Agnd GND, Dgnd GND

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Circuit Description

Table 2. EVM Power Options

BANANA JACK

NAME

VOLTAGE

DESCRIPTION

J9

Device AGND

GND

 

J10

AGND

GND

 

J11

Device AVDD

3.3

Device analog supply

J12

Amplifier negative

–5

THS4509 Vs– supply

 

rail

 

 

J13

Amplifier positive rail

5

THS4509 Vs+ supply

J14

Auxiliary power

5

Supplies power to all peripheral circuitry including the FPGA

 

 

 

and PROM. Voltages rails are created by using TI'sTPS75003

 

 

 

voltage regulator.

J15

Device DVDD

3.3

Device internal digital output supply

J16

DGND

GND

 

J17

DGND

GND

 

J20

 

 

If TP11, TP12, and TP13 are tied low, the TPS75003 is

 

 

 

disabled. In this case, one can supply 3.3 V to pin 1, 1.2 V to

pin 2, and 2.2 V to pin 3 of J20 while connecting the ground to J17.

 

74

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 Decoupling Cap

 

 

− dBFS

73

 

 

 

 

 

 

 

 

 

 

 

72

 

 

 

 

 

 

 

 

 

 

 

Ratio

 

 

 

 

 

Baseline-All Decoupling Caps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal-to-Noise

71

 

 

 

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SNR −

69

 

 

 

 

 

 

 

 

 

 

 

 

68

 

 

 

 

 

 

 

 

 

 

 

 

9.97

19.94

30.13

40.33

50.13

60.13

69.59

79.87

89.75

100.33

130.13

170.13

 

 

 

 

 

fIN − Input Frequency − MHz

 

 

 

G001

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1. ADS5547 SNR Performance vs Decoupling

3.2.3Analog Inputs

The EVM can be configured to provide the ADC with either transformer-coupled or differential amplifier inputs from a single-ended source. The inputs are provided via SMA connector J3 for transformer-coupled input or SMA connector J1 for differential amplifier input. To set up for one of these options, the EVM must be configured as follows:

1.For a 1:1 transformer-coupled input to the ADC, a single-ended source is connected to J3. Confirm that SJP4 has pins 2 and 3 shorted, and that SJP5 has pins 2 and 3 shorted. The transformer used, the Mini-Circuits TC4-1W, forms an inherent band-pass filter with a pass band from 3 MHz to 800 MHz. This is the default configuration for the EVM.

2.One can use a TI THS4509 amplifier to drive the ADC by applying an input to J1. Reconfigure SJP4 and SJP5 such that both have pins 1 and 2 shorted. A 5-VDC supply must be connected to the board to provide power to U3 for this configuration.

The THS4509 amplifier path converts a single-ended signal presented on J1 into a differential signal.

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SLWU028B –January 2006 –Revised November 2006

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Contents Users Guide Submit Documentation Feedback Contents List of Figures Users Guide EVM Basic FunctionsEVM Lvds Output Mode Quick Start Default EVM Cmos Output Mode Quick StartSchematic Diagram Configuration OptionsDIP Switch SW1 PowerEVM Power Options GNDAgnd GND Dgnd GNDTHS4509 + ADS5545 EVM Performance Clock Input Digital OutputsOutput Connector J4 CLK GNDEye Diagram of Data on Header J4 Test Points LED Operation Optional USB SPI Interface Custom Fpga CodeExpansion Slot PCB Layout Top LayerLayer 2, Ground Plane Layer 3, Power Plane #1 Layer 4, Power Plane #2 Layer 5, Ground Plane Layer 6, Bottom Layer Bill of Materials Bill of Materials ERJ-3GEY0R00V P0.0GCT-NDERJ-GE0R00X P0.0JCT-NDBill of Materials Qfnmod THS4509RGTTXCF16PFSG48 48PINBGAXILINX TPS75003RHLRPCB Schematics Schematics for the EVM are on the following pagesReset DrvddVCM +IN aINP +VCCVCC Dewonck VenableClkp Clkm Ctrlle IOL12N1/A3/RHCLK7 Mode Reset IOL10N3/LHCLK5VCCO1 VCCO3Vccint OE/RESET CLK Busy Clkout CclkDone Vccint Vccint ProgbSS3 Agnd EN1 SS1 Dgnd SW1 IN1 IS1 IN3 FB1OUT3 FB2 Dgnd FB3 EN3 EN2 SS2 SW2 IN2 IS2Fpga Power SUPPLY5V Drvdd + VCCVDD Outpu Tbuffer ADC Digital SUPPLY3.3VEvaluation BOARD/KIT Important Notice FCC Warning EVM Warnings and RestrictionsImportant Notice

ADS5525, 27, 47, 45, 46 specifications

Texas Instruments is a leader in the field of analog and mixed-signal semiconductors and offers a diverse portfolio of high-performance products. Among its notable offerings are the ADCs (Analog-to-Digital Converters) such as the TI 46, 45, 47, 27, and the ADS5525. These devices are engineered to meet the demanding requirements of various applications, including communications, industrial, and medical systems.

The Texas Instruments 46 series ADCs are recognized for their high speed and precision. They utilize a 14-bit architecture with sampling rates of up to 1.5 GSPS, which makes them ideal for high-frequency applications such as communications and instrumentation. One of the key features is their ability to support a wide input bandwidth, which allows for accurate conversions of high-frequency signals.

The 45 series, similar in architecture, excels in environments where power efficiency is paramount. These ADCs are designed to consume less power while maintaining high performance. They offer a flexible sampling rate, providing options for both lower and higher intensity applications. This versatility is essential for handheld and portable devices where battery life is crucial.

Moving on to the 47 family, these devices focus on achieving high dynamic range and low distortion. Their architecture includes sophisticated digital filter options, enhancing the capability of noise reduction and signal integrity. With an impressive signal-to-noise ratio, the 47 series finds its usage in systems where performance cannot be compromised, such as high-end audio and video applications.

The 27 series ADCs provide an excellent combination of high performance and low latency, making them suitable for real-time analysis in various scenarios. They are equipped with advanced data acquisition features and can communicate seamlessly with modern digital signal processors and microcontrollers.

Finally, the ADS5525 is a standout in the lineup, offering a 12-bit resolution at a maximum sampling rate of 125 MSPS. This device is designed for a range of applications, including medical imaging and ultrasound systems. It boasts features such as an integrated digital filter and multiple power-saving modes, making it versatile and efficient in terms of energy consumption.

In summary, Texas Instruments' ADC lineup, including the 46, 45, 47, 27, and ADS5525, offers numerous features and technologies, catering to a wide range of applications through their respective specifications of speed, power efficiency, dynamic range, and ease of integration. These devices illustrate Texas Instruments' commitment to providing innovative solutions in the analog and mixed-signal domain.
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